HYDROGEN MCQs – 2

1) Which one of the following metals will not reduce H2O ?
a) Ca
b) Fe
c) Cu
d) Li

2) Which one of the following is reduced by H2O2 in acid solution ?
a)
b) KI
c)
d)

3) D2O is used more in
a) the chemical industry
b) Nuclear reactors
c) Pharmaceutical preparations
d) Insecticide preparations

4) Which of the following is correct for hydrogen?
a) It can form bonds in +1 as well as in -1 oxidation state
b) It is collected at the cathode
c) It has a very high ionisation potential
d) All of these

5) A sample of hard water was found to contain 68 ppm of CaSO4 and 19 ppm of MgCl2. Its total hardness is
a) 70 ppm
b) 50 ppm
c) 20 ppm
d) 100 ppm

6) A@ Which of the following statements is correct ?
a)
b)
c)
d) All are correct

7) The weight percentage of D2 in heavy water is
a) 22
b) 11.11
c) 4
d) 20

8) Protium, deuterium and tritium
a) Are isotopes of hydrogen
b) Have similar chemical properties
c) Have their atomic masses in the ratio of 1 : 2 : 3
d) All are correct

9) The ortho and para hydrogen have the
a) Same physical properties but different chemical properties
b) same chemical properties but different physical properties
c) Same chemical and physical properties
d) Different physical and chemical properties

10) Heavy water is obtained by
a) the evaporation of water
b) Keeping water in nuclear reactors
c) Prolonged electrolysis of ordinary water
d) adding impurities to ordinary water

11) Para hydrogen is
a) Less stable than ortho hydrogen
b) More stable than ortho hydrogen
c) As stable as ortho hydrogen
d) None

12) Name the metal which liberates H2 gas when reacted with either acid or NaOH
a) Fe
b) Zn
c) Cu
d) None

13) Hydrogen peroxide is not used
a) As a reducing agent
b) As an oxidising agent
c) As a dehydrating agent
d) As a bleaching agent

14) The bleaching action of H2O2 is due to
a) Reduction
b) Oxidation
c) Decomposition of colouring matter
d) None

15) Heavy water freezes at
a)
b)
c)
d)

16) The decomposition of H2O2 is retarded by
a) Acetanilide
b) Manganese oxide
c) Zinc
d) Finely divided metals

17) The volume of O2 gas liberated at STP by the decomposition of 15 mL of 20 volume H2O2 solution is
a) 150 mL
b) 300 mL
c) 200 mL
d) 250 mL

18) On shaking H2O2 with acidified potassium dichromate and ether, the etherial layer becomes
a) Green
b) Blue
c) Red
d) Colourless

19) A substance gives off O2 when heated, turns an acid solution of KI violet, and reduces acidified KMnO4. The substance is
a)
b)
c)
d) All of these

20) A sample of water contains 111 ppm of CaCl2. The hardness of that water sample is
a) 111
b) 50
c) 100
d) 555

21) Activated hydrogen is obtained by
a) Electrolysis of heavy water
b) Reaction of water with heavy metals
c) Thermal decomposition of water
d) Passing silent electric discharge through hydrogen at low pressure

22) The degree of hardness is defined as the number of parts by weight of CaCO3 or its equivalent present in
a) A million parts by weight of water
b) A thousand parts by weight of water
c) A hundred parts by weight of water
d) Ten million parts by weight of water

23) Which of the following is not used as a water softener for permanent hardness ?
a) NaOH
b)
c)
d) Sodium hexametaphosphate

24) In which of the following reactions is H2O2 acting as a reducing agent?
a)
b)
c)
d)

25) H2O2 is stored in a/ an
a) Iron container after addition of stabilizer
b) Glass container after addition of stabilizer
c) Plastic container after addition of stabilizer
d) None of these

26) Which of the following is not present in clear hard water?
a)
b)
c)
d)

27) H can be placed in VII A group because
a) H is light
b) H contains one electron only
c) It forms hydrides like NaH
d) It has isotopes D and T

28) Hydrogen is not obtained when zinc reacts with
a) Cold water
b)
c) Dilute HCl
d) Hot 20% NaOH

29) Permanent hardness of water can be removed by
a) Ion exchange resins
b) Permutit
c) Lime soda process
d) All are correct

30) In the case of H2O2 the O-O bond length is
a)
b)
c)
d)

31) Hydrogen does not combine with
a) Sb
b) Na
c) Bi
d) He

32) H2O2 converts potassium ferrocyanide to ferricyanide. The following change is observed in the oxidation state of iron:
a)
b)
c)
d)

33) Titanium salts give the following colour with H202:
a) Violet
b) Blue
c) Yellow
d) Orange Red

34) The metal that can displace hydrogen from boiling NaOH solution is
a) As
b) Zn
c) Mg
d) Fe

35) Which of the following does not cause hardness of water ?
a)
b)
c)
d)

36) The oxidising property of H2O2 is best explained by assuming that the two oxygen atoms in its molecule are
a) Bonded differently
b) Bonded similarly
c) Bonded covalently
d) Bonded by hydrogen bonds

37) When the same amount of Zn is treated separately with excess of H2SO4 and excess of NaOH solution, the ratio of the volume of H2 evolved is
a) 1 : 1
b) 1 : 2
c) 2 : 1
d) 9 : 4

38) The hydrogen produced in contact with the substance to be reduced is known as
a) Ordinary hydrogen
b) Nascent hydrogen
c) Atomic hydrogen
d) Heavy hydrogen

39) Permanent hardness of water is due to the presence of
a)
b)
c) Ca, Mg sulphates and chlorides
d) None

40) The most reactive state of hydrogen is
a) Atomic hydrogen
b) Heavy hydrogen
c) Molecular hydrogen
d) Nascent hydrogen

41) Hydrogen resembles both halogens and alkali metals in that
a)
b)
c)
d) All the above

42) The decomposition of H2O2 is accelerated by
a) Glycerine
b) Alcohol
c) Phosphoric acid
d) Pt powder

43) Which of the following liberates hydrogen when treated with HNO3 ?
a) Ag
b) Cu
c) Mg
d) Hg

44) Reactions between the following pairs will produce hydrogen except
a) Cu + HCl
b)
c) Mg + Steam
d) Na + Alcohol

45) H2O2 acts as an oxidising agent in
a) Acidic as well as alkaline medium
b) Neutral medium
c) Acidic medium only
d) Alkaline medium only

46) In the reaction between CuO and H2, the hydrogen
a) Is reduced
b) Is a catalyst
c) Loses electrons
d) Acts as an oxidising agent

47) When H2O2 is treated with chlorine
a)
b)
c) Hypochlorous acid is formed
d)

48) The catalyst used in the Bosch process of manufacture of H2 is
a) Finely divided Ni
b)
c) Pd
d)

49) Which is the poorest reducing agent ?
a) Hydrogen
b) Nascent hydrogen
c) Atomic hydrogen
d) All have the same reducing strength

50) In which of the following reactions H2O2 is not acting as an oxidising agent ?
a)
b)
c)
d)

51) H2O2 reduces K3 [Fe(CN)6] in
a) Neutral solution
b) Acidic solution
c) Alkaline solution
d) Non-polar medium

52) Hydrogen can reduce
a)
b)
c)
d) All of these

53) An ionic compound is dissolved simultaneously in heavy water and ordinary water, its solubility is
a) Larger is heavy water
b) Smaller in heavy water
c) Solubility is same in both waters
d) Smaller is simple water

54) Which of the following statements regarding H2O2 is wrong ?
a) It is stable in acid medium
b) It acts as oxidising as well as reducing agent
c) It has zero dipole moment
d)

55) H2O2 acts as an antiseptic due to its
a) Reducing property
b) Oxidising property
c) Bleaching property
d) Acidic property

56) All the following substances react with water. The pair that yields the same gaseous product is
a)
b)
c)
d)

57) On boiling temporary hard water may produce
a)
b)
c)
d)

58) In H2O2 the proton (H+) exists as
a)
b)
c)
d) All the above

59) A mixture of hydrazine (N2H4) and 58 – 60% solution of H2O2 is used as
a) Antiseptic
b) Fertilizer
c) Rocket fuel
d) None

60) Deliquescent substances are also called
a) Hygroscopic
b) Metamorphic
c) Polymorphic
d) None

61) An example of a salt-like hydride is
a)
b)
c)
d)

62) The pH values of D2O and H2O at 25°C are
a) 7, 7
b) 7.35, 7
c) 7, 6.85
d) 6.85, 7.35

63) Heavy water is not used for drinking because
a) It is poisonous
b) It is costly
c) Its physiological action is different from ordinary water
d) Its chemical properties are different from ordinary water

64) In acid medium, H2O2 acts as an oxidising agent in its reaction with
a)
b)
c)
d)

65) The hardness of water
a)
b)
c) Is estimated by titration with EDTA
d) All of the above

66) The substance which reduces the speed of decomposition of H2O2 is
a)
b) NaOH
c) Alcohol
d) Pt

67) Hydrogen has three isotopes. The number of possible diatomic molecules will be
a) 2
b) 6
c) 9
d) 12

68) H2O2 is
a) Diamagnetic
b) Paramagnetic
c) Ferromagnetic
d) None of these

69) In the reaction of ozone and H2O2 the latter acts as a/an
a) Oxidising agent
b) Reducing agent
c) Bleaching agent
d) Both oxidising and reducing agent

70) The bond energy of the covalent O -H bond in water is
a) Equal to the bond energy of the hydrogen bond
b) Greater than the bond energy of the hydrogen bond
c) Less than the bond energy of the hydrogen bond
d) None

71) H2O2 is used as
a) An oxidant
b) A reductant only
c) An acid only
d) An oxidant, reductant and acid

72) Ortho and para hydrogen are similar in the property of
a) Thermal conductivity
b) Magnetic property
c) Chemical reactions
d) Heat capacity

73) When different metals like Zn, Sn, Fe are added to dilute sulphuric acid, the same gas, which burns explosively in air, is evolved. The gas is
a)
b)
c)
d)

74) Ozone reacts with H2O2 to give oxygen. One volume of ozone gives
a) One volume of oxygen
b) Half volume of oxygen
c) 1.5 volume of oxygen
d) Two volumes of oxygen

75) 10 volumes of H2O2 is a solution with a strength of approximately
a) 3%
b) 30%
c) 10%
d) 5%

76) Hydrogen may directly combine with
a) Mg
b) Cu
c) Ni
d) Ca

77) For making H2O2 in a laboratory
a)
b)
c)
d)

78) The percentage of para hydrogen in ordinary hydrogen increases when the
a) Temperature is lowered
b) Temperature is increased
c) Pressure is increased and the temperature is decreased
d) None

79) The conversion of ordinary hydrogen into atomic hydrogen is
a) Nuclear reaction
b) An endothermic reaction
c) An exothermic reaction
d) A decomposition reaction

80) Which of the following is a true peroxide?
a)
b)
c)
d)

81) Hydrogen acts as an oxidising agent in its reaction with
a)
b)
c) Na
d) S

82) The shape of the H2O2 molecule is
a) Tetrahedron
b) Pyramidal
c)
d) Square planar

83) The negative catalyst for the decomposition of H2O2 is
a)
b) Dil. NaOH
c) Glycerol
d) Powdered Ag

84) The hybridisation of the orbitals of oxygen in H2O2 is
a)
b) sp
c)
d)

85) The number of protons, electrons and neutrons in a molecule of heavy water is respectively
a) 10, 10, 10
b) 8, 10, 11
c) 10, 11, 10
d) 11, 10, 10

86) The ionisation of the hydrogen atom gives a/an
a) Hydride ion
b) Hydronium ion
c) Proton
d) Hydroxyl ion

87) Which of the following hydrides is the most powerful reducing agent?
a) HF
b) LiH
c)
d)

88) When a molten ionic hydride is electrolysed
a)
b)
c)
d)

89) In an H2O2 molecule
a) Two hydrogen atoms are connected to one of the oxygen atoms
b) All the four atoms are in the same plane
c) The four atoms are arranged in a non-linear and non-planar manner
d) None

90) Commercially H2O2 is now prepared by
a)
b)
c)
d) By burning hydrogen in excess of oxygen

91) A given solution of H2O2 is 30 volume. Its concentration in terms of molarity is
a) 9.1 M
b) 2.65M
c) 2.5 M
d) 26.8 M

92) In the presence of finely divided Ni, hydrogen reacts with vegetable oils. The process is known as
a) Halogenation
b) Hydrogenation
c) Occlusion
d) Oxidation

93) At absolute zero
a) Only para hydrogen exists
b) Only ortho hydrogen exists
c) Both para and ortho hydrogen exist
d) None of these

94) Which of the following statements is correct ?
a) Deuterium has two electrons
b) Deuterium has two protons
c) Deuterium has the same mass as that of hydrogen
d) Deuterium has the same atomic number as that of hydrogen

95) The approximate mass of tritium oxide is
a) 18 amu
b) 20 amu
c) 22 amu
d) 24 amu

96) Which of the following solutes will produce temporary hardness in water ?
a)
b)
c) NaCl
d)

97) H2O2 is
a) a poorer polar solvent than water
b) a better polar solvent than water
c) Both have the same polarity
d) A better polar solvent but its strong oxidising property limits its use as such

98) H2O2 is commonly prepared in the laboratory by the reaction
a)
b)
c)
d)

99) Which of the following is used to sterilise water ?
a)
b)
c)
d)

100) The salt responsible for the permanent hardness of water is
a)
b)
c)
d) NaCl


Answer

Related Posts
Comment ( 1 )
  1. 94Fannie
    August 2, 2017 at 8:22 am
    Reply

    Hi admin, i must say you have very interesting articles here.

Leave a reply
Captcha Click on image to update the captcha .